Advantages Provides physical evidence Lower detection limits Can monitor integrity of air sampling tube Less prone to interference Disadvantages Different tapes required for different gases - Mineral acid tape will not detect Chlorine - Hydrides tape will not detect Ammonia Significant lag time between samples Long dwell time (30-60 Sec. to reach 1/2 PEL) Can not detect combustible or flammable gases Cost - High initial capital investment - Recurring cost of replacement tapes